Why is my toilet running constantly?

From the experts at Rapid Rooter Plumbing

In homes across the Phoenix metro area, from Peoria to Queen Creek, one of the most common—and most ignored—plumbing issues we encounter is a toilet that won’t stop running. It may seem like a minor nuisance, but a constantly running toilet can waste thousands of gallons of water a month and signal wear that leads to bigger leaks.

Let’s break down why it happens, what you can safely check, and when it’s time to call in our team.

What Causes a Toilet to Run Constantly?

Most running toilets boil down to one of three common causes:

Worn Flapper Valve – This is the rubber piece that lifts and seals the flush valve. Over time (typically every 5 years), it can warp, crack, or misalign, causing water to continuously seep into the bowl.
Stuck or Misaligned Float – If the float is set too high or is catching on the tank, the water won’t shut off properly.
Faulty Fill Valve – This component controls the refill after flushing. Age, debris, or hard water can affect its function.

If you have a water softener, these parts may last longer, but most toilets in Arizona homes need some service every five years.

What You Can Safely Check

No tools? No problem. Here are two safe things you can do:

Listen Closely: Remove the tank lid and listen. A steady trickle usually means a flapper issue. A sporadic hiss points to the fill valve.
Drop Dye Test: Add a few drops of food coloring to the tank and wait 15 minutes (don’t flush). If color shows up in the bowl, you’ve got a flapper leak.

Still not sure? That’s where we come in.

When to Call Rapid Rooter (and What It Costs)

Our basic diagnostic visit is $79 and can usually spot the issue fast. Most toilet repairs fall between $210 and $450 depending on the part and labor needed. We never push full replacements unless absolutely necessary, and we always show you the issue before we fix it.

If you’re a member, that $79 diagnostic fee is waived, and you get 15% off any repairs.

Why Small Toilet Leaks Become Big Problems

A constantly running toilet isn’t just an annoyance. It puts wear on your fill valve and flapper, spikes your water bill, and can even cause moisture issues around the base if unnoticed.

For multi-bathroom homes, it’s easy to miss a quiet leak for weeks. That’s why inspections matter.

The Rapid Rooter Membership Advantage

At just $9.99/month, our Club Membership includes:

Annual plumbing inspections
15% off all toilet repairs
Free diagnostics and camera inspections (if needed)
Priority booking and 24/7 emergency access
Bi-annual drain cleaning and water heater service

You’ll know your plumbing’s in shape—before a running toilet becomes a costly leak.

Quick Tip for Prevention

Mark your calendar: every 5 years, check your toilet’s internal parts or ask us to during your annual inspection. And if you’ve just moved into a resale home, it’s smart to get it looked at sooner.

Final Word: A Small Fix Can Save a Lot

We see it every week: a quick $220 part and labor visit saves hundreds in water waste and frustration. Whether you’re in a newer build in Gilbert or an older home in Central Phoenix, don’t ignore the sound of running water.

Give yourself peace of mind—ask us about the Rapid Rooter Membership and let us take care of your home’s plumbing from the inside out.

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